الكافي- ط الاسلامية, volume 4, page 317

8. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from certain persons of our people from Ali ibn Muhammad al- Ash‘ath from Ibrahim al-Hadramiy from his father who has said the following: “I once returned from Makkah and met abu al-Hassan, Musa (a.s.), in the Masjid sitting between the pulpit and the grave. I said, ‘O child of the Messenger of Allah, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, when I go out to Makkah, perhaps a man asks me to perform a Tawaf and two Rak‘at Salat (prayer) for him, but I become busy and cannot do so. When I return I do not know what to say to him. He (the Imam) said, ‘When you go to Makkah and complete the acts, perform a Tawaf and two Rak‘at Salat (prayer). Then say, ‘O Lord, this Tawaf and these two Rak‘at are for my father, mother, wife, children, my protectors, and for all of the people of my city, the free and slaves, white and black.’ Thereafter if you say to a man that you have performed Tawaf and two Rak‘at Salat (prayer) for him, you will be truthful. When you come to the grave of the Holy prophet, O Allah, grant compensation to Muhammad and his family worthy of their services to your cause, after completing what is obligatory upon you, perform two Rak‘at Salat (prayer). Then stand near the head of the Holy prophet (a.s.), and say, ‘I offer you greeting of peace, O the Holy prophet of Allah. I do this for my father, mother, wife, children, all of my protectors, all people of my city, the free ones, the slaves, the white and black ones.’ Thereafter if you say to a man that you have offered greeting of peace to the Messenger of Allah, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, for him, you have remained truthful.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.